...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of vision >Age-related effects of size and contrast on binocular rivalry
【24h】

Age-related effects of size and contrast on binocular rivalry

机译：大小和对比度对双眼竞争的年龄相关影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Little currently is known about how binocular rivalry changes with aging. However, by studying factors with well-known effects on binocular rivalry, such as contrast and size, a foundation for future studies of aging can be established. The current study measured binocular rivalry in young adults (aged 20-29), junior-seniors (aged 61-69), and senior-seniors (aged 71-78). Stimuli were pairs of orthogonal oblique sine wave gratings presented dichoptically. Stimuli size (diameter = 2.4[sup]o [/sup]or 4.3[sup]o[/sup]) and contrast level (0.2 or 0.8) varied across trials. On each trial, participants tracked alternations among four percepts (i.e., the two exclusive percepts, mixed, and other). Participants were instructed to report the "other" percept if they perceived fading of the stimuli or any percept that did not match the given response options. Dependent measures were the average duration and proportion of time subjects reported viewing each percept. The average durations for both exclusive percepts were longer in older adults, supporting previous findings (Jalavisto, 1964, Gerontologia, 9, 1a??8; Ukai et al., 2003, Percept. Mot. Skills, 97, 393a??397). Additionally, the strength of monocular dominance increased with age, particularly when viewing our smaller stimuli, and the proportion of mixed percepts decreased with age. Across all participants there was a marginally significant increase in the proportion of mixed percepts for our larger stimuli, consistent with previous results obtained with younger participants (Blake et al., 1992, Vis. Neurosci., 8, 469a??478). In the low contrast condition, senior-seniors reported a statistically higher proportion of other percepts, presumably representing a greater amount of stimulus fading. Overall the senior-seniors were the most statistically different. The sequential pattern of alternations between percepts also varied across age groups. Control experiments indicate that these results were not due to age differences in motor response time or retinal illuminance. The theoretical implications of these results will be discussed.
机译：目前关于双眼竞争如何随年龄变化而知之甚少。但是，通过研究对双眼竞争有众所周知影响的因素（例如对比度和大小），可以为以后的衰老研究奠定基础。当前的研究测量了年轻人（20-29岁），初中（61-69岁）和高中（71-78岁）的双眼竞争。激励是双折射的成对的正交斜正弦波光栅对。刺激大小（直径= 2.4或4.3）和对比水平（0.2或0.8）因试验而异。在每项试验中，参与者跟踪了四种感知（即，两个排他性感知，混合感知和其他感知）之间的交替。如果参与者感觉到刺激消失或与给定的响应选项不匹配的任何感知，则被指示报告“其他”感知。依赖的度量标准是受试者报告查看每种感知的平均持续时间和时间比例。老年人的两种排他性知觉的平均持续时间更长，这支持了以前的发现（Jalavisto，1964; Gerontologia，9，1a ?? 8; Ukai等，2003，Percept。Mot.Skills，97，393a ?? 397）。 。此外，单眼优势的强度随着年龄的增长而增加，特别是在观察我们较小的刺激时，混合感知的比例随着年龄的增长而下降。在所有参与者中，对于我们较大的刺激，混合感知的比例略有显着增加，这与较年轻的参与者先前获得的结果一致（Blake等，1992，Vis。Neurosci。，8，469a-478）。在低对比度条件下，高级老年人报告了其他感知的统计上更高的比例，大概代表了更多的刺激褪色。总体而言，高年级学生在统计学上差异最大。不同年龄段的感知之间交替的顺序模式也有所不同。对照实验表明，这些结果不是由于运动反应时间或视网膜照度的年龄差异所致。将讨论这些结果的理论含义。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号